libultra files and directories restructure (#1038)

* Restructure files, begin header restructure

* Format

* us2dex

* Fix parallel spelling

Co-authored-by: JoshDuMan <40190173+JoshDuMan@users.noreply.github.com>

* Use OS_K0_TO_PHYSICAL in place of VIRTUAL_TO_PHYSICAL in osAiSetNextBuffer

* Uppercase hex, exception vector address defines

* Interrupt flags 1

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

* Interrupt flags 2

Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

Co-authored-by: JoshDuMan <40190173+JoshDuMan@users.noreply.github.com>
Co-authored-by: Dragorn421 <Dragorn421@users.noreply.github.com>

src/libultra/libc/llcvt.c

@@ -0,0 +1,33 @@
+#include "global.h"
+
+s64 __d_to_ll(f64 d) {
+    return d;
+}
+
+s64 __f_to_ll(f32 f) {
+    return f;
+}
+
+u64 __d_to_ull(f64 d) {
+    return d;
+}
+
+u64 __f_to_ull(f32 f) {
+    return f;
+}
+
+f64 __ll_to_d(s64 l) {
+    return l;
+}
+
+f32 __ll_to_f(s64 l) {
+    return l;
+}
+
+f64 __ull_to_d(u64 l) {
+    return l;
+}
+
+f32 __ull_to_f(u64 l) {
+    return l;
+}